Quad Star
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Chapter 7. Case Studies
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Quad Star
A star-like object built from cubes.
Figure 7.23. Quad Star
some cubes glued together
vertices:
56
faces:
54
edges:
108
genus:
0
characteristic polynomial:
(-3 + x)
2
(-1 + x)
11
(1 + x)
11
(3 + x)
2
(-3 + 12x - 7x
2
+ x
3
) (3 + 12x + 7x
2
+ x
3
) ( -1 + 11x -x
2
- 4x
3
+ x
4
)
3
(-1 - 11x - x
2
+ 4x
3
+ x
4
)
3
dual's characteristic polynomial:
(-4 + x) (-3 - x + x
2
) (-1 - x + x
2
) (-1 - x + x
2
)
3
(-1 + x + x
2
)
3
(5 + 5x + x
2
) (-3 - 6x + x
2
+ 4x
3
+ x
4
)
3
(-8 + 5x + 14x
2
- 3x
3
- 4x
4
+ x
5
)
3
(18 + 23x - 8x
2
- 13x
3
+ x
5
)
chromatic number:
3
lattice group (lossy):
Z(2)
19
×
Z(3)
9
× A(9)